Tapered Slab Volume calculator.
Measure a rectangular concrete component whose thickness changes linearly between two ends.
Your inputs
Use measurements from your plan and properties from your chosen product. Any prefilled values are illustrative.
A clear estimate starts here.
Enter your dimensions and product details to see the quantity and purchase breakdown.
Formula and assumptions
How this calculation works.
Uses two measured endpoint thicknesses and a linear taper. It does not choose slab thickness, drainage slope or reinforcement.
A worked example
Illustrative inputs only. Product properties and design dimensions are not recommendations for your project.
- Length along taper
- 4 m
- Width
- 3 m
- Thickness at first end
- 100 mm
- Thickness at other end
- 200 mm
- Volume allowance
- 10 %
Concrete order volume: 1.98 m³
Before you purchase
Use dimensions from your plan and properties from your chosen product. Any design spacing, section or fixing pattern must already be specified.
Uses two measured endpoint thicknesses and a linear taper. It does not choose slab thickness, drainage slope or reinforcement.
Method: dimensional arithmetic and user-supplied specifications. Software checks: 2026-10-04. Calculation and review policy.